Envoy HTTP/3 Not Supported

What is Envoy HTTP/3 Not Supported

Understanding Envoy and Its Purpose

Envoy is a high-performance open-source edge and service proxy designed for cloud-native applications. It facilitates service discovery, load balancing, and secure communication between microservices. Envoy is widely used in service mesh architectures, acting as a communication layer that abstracts the complexities of network communication.

Identifying the Symptom: HTTP/3 Not Supported

When attempting to use HTTP/3 with Envoy, you might encounter issues where the protocol is not supported. This can manifest as connection failures or fallback to HTTP/2 or HTTP/1.1, depending on the client configuration. The absence of HTTP/3 support can lead to suboptimal performance, especially in high-latency environments.

Exploring the Issue: Why HTTP/3 Might Not Be Supported

HTTP/3 is the latest version of the HTTP protocol, leveraging QUIC as its transport layer. For HTTP/3 to function, both the client and server (Envoy in this case) must support it. If either side lacks the necessary configuration or libraries, HTTP/3 will not be available.

Envoy Configuration

Envoy must be built with HTTP/3 support, which requires specific libraries and configurations. If Envoy is not compiled with these options, it will not support HTTP/3.

Client Configuration

The client must also support HTTP/3. This typically involves using a modern browser or a client library that supports the protocol.

Steps to Fix the Issue

Step 1: Verify Envoy Version and Build

Ensure that you are using a version of Envoy that supports HTTP/3. You can check the Envoy version history to confirm support for HTTP/3. Additionally, verify that Envoy is built with the necessary QUIC libraries.

envoy --version

Step 2: Update Envoy Configuration

Modify the Envoy configuration to enable HTTP/3. This involves setting up the appropriate listener and filter chains. Refer to the Envoy documentation for detailed configuration options.

static_resources: listeners: - name: listener_0 address: socket_address: { address: 0.0.0.0, port_value: 443 } filter_chains: - filters: - name: envoy.filters.network.http_connection_manager config: codec_type: AUTO stat_prefix: ingress_http http_filters: - name: envoy.filters.http.router

Step 3: Ensure Client Compatibility

Verify that the client supports HTTP/3. For browsers, ensure they are up-to-date. For custom clients, use libraries that support HTTP/3, such as quiche or quic-go.

Step 4: Test the Configuration

After configuring both Envoy and the client, test the setup to ensure HTTP/3 is functioning. Use tools like SSL Labs to verify protocol support or browser developer tools to inspect the network protocol being used.

Conclusion

By ensuring both Envoy and the client are properly configured for HTTP/3, you can take advantage of the performance improvements offered by the latest HTTP protocol. Regularly updating your software and configurations will help maintain compatibility and performance.